Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d5a9357303650…

MALICIOUS

PDF

81.7 KB Created: 2021-03-05 08:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c82bf6661f7c59475b7b1c4f2cf8053 SHA-1: ecb9d949f3b57f0e18fcf79b29f3bab2e411f2f1 SHA-256: a16d5a9357303650f09c0a6e4216b87dab8b9ae3338ab69018f0782247034440
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple embedded URLs, with a primary focus on directing users to 'soxebez.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/award?keyword=dean+koontz+book+signing+2020 PDF link annotation
    • http://vumajufeboxidik.mywebcommunity.org/toziwoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fca8007101bd.pdfIn PDF document text
    • http://tokio-2020.fun/debriefing_sheet_sampleicai7.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/supabikixi.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/pafexepigufiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601308423145d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fc5a39baf20e.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/how_dangerous_was_chernobyl_reddit.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/60361170659.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/storm_front_dresden_files_epub.pdfIn PDF document text
    • http://curvepreloved.com/51881959491ry7so.pdfIn PDF document text
    • http://lightstart.xyz/9002244748138v4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_603820d0598f9.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/la_divina_comedia_quien_fue_el_autor.pdfIn PDF document text
    • http://reduslim-sito.site/wiwifezotapijutususijudk94v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_602317a364abf.pdfIn PDF document text
    • http://liolika-rsya.ru/pasaxipxk7fh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_600bfe4893dff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keregimuw.onlinewebshop.net/how_to_pass_the_pmp_exam_in_14_days.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/2006_chevy_equinox_engine_replacement.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/laralasejubal.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/how_long_is_a_short_research_paper.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/the_natural_book_series.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 5252 bytes
SHA-256: 49605bb40e6a5723c4396d721310b7f9a95ed072c05287f40cb1bb2800dfe369
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 9996 bytes
SHA-256: 1112f6580327659631e3a9e80d3a61ab1216fb3e1bb6314ada99c760dcd5ec01

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